SOLUTION: Abby's job is to order stone slabs for her customers. Each slab measures 1 meter x 1 meter. Abby works out the number of slabs that will be needed to surround pools. For example

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Question 1093765: Abby's job is to order stone slabs for her customers. Each slab measures 1 meter x 1 meter. Abby works out the number of slabs that will be needed to surround pools. For example, a pool that is 2 x 2 will require 12 stone slabs. Each side of the pool must be a whole number of meters long.
Work out a formula that she can use to easily calculate the number of stone slabs that will be needed to surround any pool. Let x be the width of the pool and y be the length of the pool.

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The perimeter of the 2x2 pool is +4%2A2+=+8+ m
It looks like Abby added +4+ m to that for the corners
+8+%2B+4+=+12+
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If width = +x+ and
length = +y+, then
The number of slabs needed is:
+2x+%2B+2y+%2B+4+
Get a 2nd opinion if needed